Update stale.yml (#115)

Author: Guy Baron

.github/stale.yml

@@ -3,9 +3,9 @@ daysUntilStale: 7
 # Number of days of inactivity before a stale issue is closed
 daysUntilClose: 7
 # Issues with these labels will never be considered stale
-# exemptLabels:
-#   - pinned
-#   - security
+  exemptLabels:
+    - bug
+    - enhancment
 # Label to use when marking an issue as stale
 staleLabel: wontfix
 # Comment to post when marking an issue as stale. Set to `false` to disable